appears to not change—constant set of macroscopic properties

equal rates for the forward and reverse reactions

and forward reaction define the changes that occur in an equilibrium

Is matter or energy being added/removed?

reverse reaction describes one of the ways the system can change

stress can favour the reverse or forward reaction to move to a new equilibrium

using

proportions of products relative to reactants is unique to conditions and described using

[products]/[reactants]

is used to

ICE tables used to apply stoichiometry to an equilibrium system